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Toro valve with or without flow regulator?

Hi,
I am troubleshooting the system in a newly bought house... I'm completely new to all this so have been reading up as much as possible, and believe that I need a new valve.. I can't seem to find an example exactly like the one I have.. But it's also the odd one out of the 6 that are currently there (maybe means it was replaced before?) it's got Toro EZ Flo written on it, but it doesn't have the screw like the others do..

The symptom I'm having is that it doesn't close the sprinkler head on that circuit.. even when I completely disconnected the solenoid.. I have taken it apart to clean etc, but no luck..

I have found 2 valves which I think could replace it, but they offer two versions: EZP-02-54 - 1"Solenoid valve with flow regulator.. and EZP-02-54 - 1"Solenoid valve without flow regulator..

Now I'm not 100% sure how a flow regulator would work in this case.. Is it for systems which have too much psi? It means you can install them in high PSI systems without issue.. whereas without a regulator, you would have to make sure the system itself is either a suitable PSI, or you have a separate regulator before in the chain.. In this case, I can't see a downside into getting the one with flow regulator..

What do you guys think? Any help greatly appreciated! Many thanks!

(PS.. if needed: the house is in Spain, but I am back & forth from England all the time.. so either UK or Europe shops are suitable.. and if any other info needed, just ask )